Question

In the given figure, $\angle 4$ = $\angle 6$. Is AB parallel to CD?

Answer 1

$\angle 4$ and $\angle 6$ are alternate interior angles. We know that, when the alternate interior angles are equal, the lines are parallel. As $\angle 4$=$\angle 6$, i.e., the alternate interior angles are equal.
$\Rightarrow$ line $AB$ is parallel to line $CD$. [2 Marks]